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@.A. FAURE 8a G. TR-ENGH.

EXPLOSIVE BLASTING MATERIAL.

i Patented Jlily 19,1881..

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UNITED STATES! PATENT @risica CAMILLE a. FAUREE'AND GEORGE TRENCH, or rAvnnsHAM, COUNTY or KENT, AssIGNoRs To THE leoTToiv .POWDER COMPANY, (LIMITEDQ or WESTMINSTER, ENGLAND.

ExeLosivs BLASTING MATERIAL- SIECIFIGATION forming part of Lettere Patent No. 244,575, dated July 1v9, 1881.

Application filed DeeemberdO, 1880. (No model.)` l

To all whom 'ztfmay concern:

Be it known that we, CAMILLE ALPHONSE FAURE and GEORGE-Tannen, both ofFav'ersham', in the county of Kent, England, have ,.5 invented a new and useful Improvement in Explosive Blasting Material, of which tbefollowing is a specification.

Our object is to provide an improved explosive material of the class which can lbe detoxo nated and which is particularly adopted 'for4 bla-stingcharges. Theadvantage ofexploding by detonation over the mode of tiring byaf cumstances that present themselves in. nJin-l ing, and such compounds are therefore expensive.

We provide an explosive which can be deto nated at a comparatively cheap rate.

In order to realize the maximum economy with the full power of the explosive, we do not mix or incorporate all theingredients together, 3 5 as heretofore; but we first compound or incorporate the oxidizing agent-such as the nitratesof soda, potasse, or baryta--with the proper amount of carbonaceous material, (charcoa-1,) and with this mixture we form grains' 4o that arehard and free from dust. `'Ioal given quantity of these so separately prepared Y grains-say ten parts by weight-we now add, say-one part (more or less) ofthe nitrocellulose previously1 purified and linely divided, andthe 45 substances are uniformly distributed, so that each grain of the nitrated compoundshall have' contiguous to it its proper proportion of nitrocellulose.

This improved explosive material is put up or packed closely for use ortransportation, so 5o as te prevent segregation of the substances or keep them in their uniformly-distributed condition. 'In this way lthe nitro-cellulose in the interstices between 'the grains,rnot being soiled or clogged by any other substance, re- 55 mains eminently apt to be detonated and to .carry the detonation through the` entire mass of granules, and by pulverizing and igniting them Aon the instant create the strongest possible eii'ectD The mode we use for iiriug the explosive :is the same as that generally used with nitro compounds-t'. c., by means of adetonator' with or Without a priming-charge.

Although we prefer the above combination 6 5 of materials, we sometimes replace the grains of charcoal and niter by ordinary gunpowder; but 'the mixture described is safer to make.

It will of course be understood that the powdered or n'ely-divided nitro-cellulose is`7o added to the grains of gunpowder in manner as before explained.

In order to prevent the segregation of the materials during transit, we pack them.rather tightly in barrels, l cases, or charges; or we 75 cause the bers ot nitro cellulose to adhere to the grains by slightly covering these with an adhesive coat of varnish or such like substance. When the tine nitro-cellulose is mixed with the rough granules oi' gunpowder it does o not readily separate from them. If the mixture is to be used at once, mere admixture is suiiicient. If the mixture is to be transported from place to place, separation ci' the materials can be prevented by slightly pressing the mix- 8 5 ture into packages; or if the mixture is toA he carried in bulk, then it may be desirable, as above stated, to use adhesive substance to Acause the ne nitrocellulose to adhere tothe large grains. 9o

The accompanying drawingrepresents .a small mass of the above-described explosive Y blastingmaterini,dindicatingthetlrge grains ulsfsubstantiaiy as ainduforv th purpose de-v xo and vo the smallgrai'ns(exztggerated in size) of scribed.

nitwcellulose distribiited among them. C. A. FAURE.

- We claim as of our own invention- G. TRENGH.

The hereinbeforedescribed improved ex- Witnesses: A y .l piosive blasting material., consisting of inti- W. WESTLEY," mately-mixed carbonaceous and oxidizing ma. T. J.' OSMAN.

terials in granular form, with 'finely-divided Bothy ofNo, 17 GracelchrctSti'et, London. nitm-cl1ui0se distributed around the grnn- 

